In this time, curtains would be hung around four-poster beds in order to help prevent drafts and keep occupants warm (Jane Austen's World, Vic, "Ways to Keep Warm in the Regency Era, Part 2").

"Bodily apparel or attire; clothing, raiment, dress" (OED). Here, it most likely refers to a riding habit, which was worn by women when riding a horse. The riding habit had also become fashionable to wear while traveling (Jane Austen's World, Vic, "Women’s Riding Outfits in the Early 18th Century").

"The outer covering of a bed, generally more or less ornamental, being woven in a raised pattern, quilted, made of patch-work, etc.; a coverlet, a quilt" (OED).

In Jane Austen's time, snuffing a candle meant "to free from the snuff, by pinching or cutting this off, or removing it with a special instrument" (OED). This allowed the candle to burn brighter.

Japan was a black varnish imported from Japan that had an exceptional hard finish. Japan could also refer to a piece done in the Japanese style that was "varnished, and adorned with painted or raised figured" (OED).